1912.] NATURAL SCIENCES OF PHILADELPHIA. 22! 



subquadrate or slightly longer than wide, narrowing but little ceph- 

 alad, cephalic margin areuato-emarginate, caudal margin arcuato- 

 truncate; of female transversely arcuate, subquadrate in form, 

 cephalic margin areuato-emarginate, caudal margin emarginato- 

 truncate; disk in both sexes cephalad with paired pyriform impressed 

 outlines flanked cephalad and caudad by single subcallous points. 

 Tegmina of male extending caudad of pronotum a distance equal or 

 subequal to the pronotal length, broad, distal margin arcuate, 

 tympanum fully developed, lateral field deep. Ovipositor cylindrical, 

 straight or but little arcuate, apex simple, not differentiated from the 

 shaft, unarmed, immediate apex acute. Subgenital plate of both 

 sexes with the distal margin not excised, this plate in females com- 

 pressed. Cerci of both sexes elongate, tapering. Cephalic tibiae with 

 the cephalic face with a distinct tympanum. Caudal femora dilated; 

 caudal tibiae straight, robust, deplanate dorsad, serrate dorso-laterad^ 

 with three pair of distal spurs, the dorso-internal shorter than the 

 ventro-internal, the medio-internal elongate, reaching to the middle of 

 the metatarsus; caudal metatarsus compressed, sulcate dorsad, 

 strongly serrate on both dorsal margins, armed disto-laterad with 

 spurs which cover the proximal portion of the terminal joint of the 

 tarsus. 



Distribution in Xoiih America. — Extending from southern X<\ 

 Mexico to the southern slopes of the Sierra Madre in California, 

 southward to the Cape Region of Lower California, and also in the 

 state of Guerrero, Mexico. 



Key to Hoplosphyrum, New Genus. 



A. Terminal palpal joint elongate, subtubiform, the distal margin 

 very obliquely subtruncate. 



B. Pronotum of male with cephalic width contained one and 

 one-half times in the greatest length of the same, somewhat 

 produced caudad; lateral lobes of male pronotum obliquely 

 areuato-emarginate caudad; ovipositor slender, subequal 

 to the caudal femora in length occidental (Scudder). 



BB. Pronotum of male with cephalic width contained very 

 slightly more than once in the greatest length of the same, 

 subquadrate; lateral lobes of male pronotum obliquely 

 subtruncate caudad, not at all areuato-emarginate; 

 ovipositor more robust, shorter than the caudal femora, 



boreale (Scudder). 

 AA. Terminal joint of palpi broader, ovate aztecum (Saussure). 



